Process of making windshields for projectiles



May 9, 1933. cox r AL 908,120

PROCESS OF MAKING WINDSHIELDS FOR PROJECTILES Filed Oct. 11. 1930 VM/VE/V/O/PJ W/rmsss. 70/7n Z. CBX

Berizar'a M 522? Patented May 9, 1933 tenant J'QI-IN L. 09X AND BERNARDM. FINE, F PHILADELPEIA, PENNSYLVANIA PROCESS OF MAKING VVINDSHIELDSPBOJECTILES Application filed Gctober 11, 1930. Serial No. 488,036.

This invention relates to Windshields for projectiles.

It is customary to provide projectiles with windshields for the purposeof minimizing wind resistance to the flight of the shell. It is usuallyrequired that such Windshields be removably secured to the projectiles.This is desirably accomplished by threading the rear end of thewindshield direct onto the projectile body (in target projectiles) ordirect onto the cap which, in service projectiles, covers the point ofthe projectile body. Nindshields provided with an internal screw threadat their rear ends are necessarily of sufficient thickness to allow thescrew thread to be formed therein without substantially weakening thewindshield at its rear end. Such thickness is much greater than isdesirable for a windshield.

One way of solving the problem is to provide a windshield of drawn steelof the desired small thickness and secure within the rear end thereof aring, the screw thread being formed on the ring.

It may be, however, desired or required to have the internal screwthreads cut into the body of the windshield so as to be integraltherewith, while still providing a windshield comparable in lightnesswith the windshield of drawn steel with a ring secured thereto.

It has been attempted to make the windshield of a single piece of drawnsteel of a uniform thickness equal to the desired thickness of thethreaded base and then to machine out the inside of the windshield tothe desired thinness. This latter operation, however, necessitates theuse of hook'or expanding tools and long cutters and is a difficult,expensive and economically impracticable operation.

It is also known to form a windshield of the desired interior shape anddimensions, upset inwardly and circumferentially the metal of the rearend, cut the screw thread in the upset rear end, and machine theexterior of the windshield from the upset rear and throughout its entirelength to the forward end. This operation presents some difficulties inthe upsetting operation, while the length of the windshield is such thatfor large calibre shells its drawing out by the use of existing pressespresents difliculties still greater or insurmountable.

- The object of the present invention is to make a windshield of lightgauge throughout except at its rear end and to make such rear end, uponwhich the screw thread is cut, integral with the body of the windshield.The invention comprises an improved process of making such a windshield,whereby the mechanical difficulties of prior-processes are entirelyovercome. In the accompanying drawing:

Fig. l is a longitudinal sectional view of the completed windshield.

Fig. 2 is a longitudinal sectional view showing the point of a cappedshe'll pro-- vided with the windshield of Fig. 1. v

Fig. 3 is a view, similar to Fig. 2, showing the windshield applieddirect to the point of the shell.

A projectile having a body a is provided with a cap 6 of any desiredtype, which may be secured to the body in any suitable way. The cap 6 isreduced in diameter in front of its rear end, to provide a shoulderagainst which the rear end of the windshield abuts. Said reduceddiameter portion of the Windshield is provided with an exterior screwthread adapted to be engaged by the interior screw thread on the rearend of the windshield, the interengaging screw threads being shown at c.

The windshield is initially made in two separate parts. The front end,or point d, of the windshield is -made, preferably, of drawn steel, andof the light gauge desired. The rear end, or butt 6, of the windshieldis made, by cast ng, forging or otherwlse, of a the thickness requiredto allow an internal thread of the desired depth to be cut in its rearend. From the rear end of the threaded portion to the front end of thebutt the interior of the butt is machined out to reduce the thickness ofits wall to the thickness of the wall of the point. inner wall of thebutt is that indicated by the dotted lines 00, the final thickness beingshown in full lines. The butt and point are The original I then securedtogether by welding along the circumferential line y.

The comparative lengths of the'point and butt of the windshield may varyfrom that 5 shown in the drawing.

The windshield may be applied direct to the projectile body, as shown inFig. 3.

The butt and point may be secured together, less preferably, by meansother than 1 welding, as by soldering, brazing or mechanieal union.

Having now fully described our invention, what we claim and desire toprotect by Letters Patent is:

The process of making a light, thin windshield which comprises forming awindshield in two parts, namely, a point of the light gauge desired anda butt of relatively thick gauge having a forward extremity 2 whoseexterior diameter is the same as the exterior diameter of the rearextremity of the point and whose interior diameter is substantially lessthan the interior'diameter of the rear extremity of the point, formingin 5 the butt an internal screw thread which ex tends from about itsrear extremity along a fractional part of the length of the butt,machining out the interior of the butt forward of the screw thread tosuch light gauge that the interior diameter of its forward extremitywill be enlarged to about the interior diameter of the rear extremity ofthe ZOll'lt and securin the rear circumferential edge of the point tothe front circumferential edge of the butt.

In testimony of which invention, we h are hereunto set our hands, atPhiladelphia, Pennsylvania, on this 19th day of September 1930. 40 JOHNL. COX.

BERNARD M. FINE.

